From mboxrd@z Thu Jan 1 00:00:00 1970 From: bgoswami@codeaurora.org Subject: [PATCH][RESEND 2] component: enhance handling of devres group for master Date: Wed, 25 Jul 2018 23:06:28 -0700 Message-ID: <1532585188-7831-1-git-send-email-bgoswami@codeaurora.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux@armlinux.org.uk, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, srinivas.kandagatla@linaro.org, Banajit Goswami List-Id: linux-arm-msm@vger.kernel.org From: Banajit Goswami The devres group opened for a master is left open-ended (without devres_group_close) even after bind() is complete. Similarly, while releasing the devres resources for master, the most recently opened devres group is selected, and released without identifying the targeted group. As the devres group opened before master bind was never closed, there may have unintended consequences of releasing devres resources that were allocated after master bind() function was complete. Change adds a devres_group_close() after bind() call to master, to encapsulate the resources allocated during bind, and then use a group ID to specifically identify the group in release, so that during master unbind, only the resources that are part of that specific devres group, are released. Signed-off-by: Banajit Goswami --- drivers/base/component.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/base/component.c b/drivers/base/component.c index 89b032f..f9ce937 100644 --- a/drivers/base/component.c +++ b/drivers/base/component.c @@ -155,17 +155,19 @@ static int try_to_bring_up_master(struct master *master, return 0; } - if (!devres_open_group(master->dev, NULL, GFP_KERNEL)) + if (!devres_open_group(master->dev, master, GFP_KERNEL)) return -ENOMEM; /* Found all components */ ret = master->ops->bind(master->dev); if (ret < 0) { - devres_release_group(master->dev, NULL); + devres_release_group(master->dev, master); dev_info(master->dev, "master bind failed: %d\n", ret); return ret; } + devres_close_group(master->dev, master); + master->bound = true; return 1; } @@ -190,7 +192,7 @@ static void take_down_master(struct master *master) { if (master->bound) { master->ops->unbind(master->dev); - devres_release_group(master->dev, NULL); + devres_release_group(master->dev, master); master->bound = false; } } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project